The diazotisation of 6,7-dimethoxy- and 7-ethoxy-6-methoxy-1-(2-amino-4,5-dimethoxybenzyl)-1,2,3,4-tetrahydro-2-methylisoquinoline (XIII) and (XVIII), followed by thermal decomposition of the resulting diazonium salt, gave O-methylflavinantine (VI), whose synthesis has proved structure (IV) for flavinantine to be correct.
T. Kametani, K. Fukumoto, F. Satoh and H. Yagi, J. Chem. Soc. C, 1969, 520 DOI: 10.1039/J39690000520
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